Sash-balance.



M. J. DUFFY.

SASH BALANCE.

APPLIOATION FILED JAN. 5, 1909. BBNHWED JULY 14, 1911.

TS-SHBET 1.

1,010,130. Patented 1101,28, 1911.

Q QQ i926 /AW As M. J. DUFFY.

sAsH BALANCE.

APPLIUATION FILED JAN. 5, 1909. RENEWED JULY 14, 1911.

Patented NOV. 28, 1911.

2 SHEETS-SHEET 2.

ma@ 13u55 BY v @@dm ATTO/NVE YS 'UNITE MICHAEL J'. DUFFY, OF NEW YORK,N. Y.

i sama-BALANCE.

Specicaton of Letters Patent.

Patented Nov. 2s, 1911.

Application filed January 5, 1909, Serial No. 470,827. Renewed July 14,1911. Serial No. 638,585.

To all whom it may concern:

Be it known that I, MICHAEL J. DUFFY, a citizen of the United States,and a resident of New York, borough of Brooklyn, county of Kings, andState of New York, have invented certain new and useful Improveinents inSash-Balances, of which the following is a full, clear, and exactdescription.

rlhis invention relates more particularly to spring balances for windowsashes.

The primary object of the invention is to provide a simple and efficientspring balance which may be held in a confined and compact space, and soconnected to either or both of the sashes of a window, that the windowwill be properly balanced and the weight thereof compensated for, andthe spring so connected and arranged as to materially assist in raisingthe sash or sashes,

thereby overcoming many of the objections incident to the ordinarymethod in which weights and similar means are employed.

Another object of the invention is to provide a spring for a window sashin which the spring has a plurality of distinct sets of convolutions,and is so held that a small. movement is imparted to the spring as comcpared to the movement of the window; and

the life of the spring thereby materially increased.

A further object of the invent-ion is tov lout in the claiinsat the endof the description.

In the drawings, Figure 1 is afront elevation of a window with one formof my invention applied thereto. Fig. 2 is a sectional plan view, takenon the line II-II of Fig. 1. Fig. 3 is an enlarged vertical section,showing in elevation the invention connected to the upper and lowerwindow sashes. Fig. 4 is a detail plan of the invention constructed tooperate two sashes. Fig. 5 is a vertical section, taken on the line V-Vof Fig. 4:; and Fig. 6 is a vertical section, taken on the line VI-VI ofFig. 4.

The window 10 may have the upper sash 11 and the lower sash 12, whichare adapted to slide vertically in the window frame in the usual manner,and projecting outward from each sash on each side substantiallycentrallythereof is a stud or projection 13 which extends through avertical slot 11 in the window frame, the projections or studs from oneof the sashes, as the lowerI one for example, being somewhat longer thanthe projections or studs of the other sash in order that as direct aconnect-ion as possible may be made with the sash balance 15. The sashbalance 15 may be variously constructed, and may be located in the upperpart of the window frame on each side thereof, and within the chamber orhollow part 16 of the windowframe, one side of which is adapted to beclosed by a door 17 which is hinged, at 1S, to the .window frame so thatthe parts of the balance may be readily accessible for repair or forother purposes.

The sash balance may be arranged in pairs where two sashes are intendedto be operated, and each sash is adapted to be connected to itsrespective balance independently of the other sash. As shown a frame 19is provided comprising a plurality of plates 20, connected by aplurality of bolts 21. Said plates are spaced apart by rota.- tablerolls 22. Each sash at each side thereof is connected to a cable, chain,spring or.

other connection 23 to one of the studs 13, and the other enc f saidconnection is held to a drum 24, the said drum being secured to a shaftor spindle 25, though said connection may be held directly 4to the shaft25 so as to rotate the saine when the flexible connection is movedoutward by the lowering of either of the sashes. Each shaft 25 has oneend of a spring 26 secured thereto, and thisr spring is so wound as toform a series of convolutions 27 about the shaft 25, and has its otherend formed into series of convolutions 28 and is held to a shaft 29.

The convolutions 28 are oppositely formed to the convolutions 27, andextending between said convolutions and the shafts 25 and 29 is the part30, which normally extends outward over one of the intermediate rolls,and the spring isso arranged that when a sash is lowered the drum 24connected thereto will operate the shaft 25 to wind the spring on saidshaft, and as the sash continues to lower will unwind the balance fromaround the shaft 29, while the upward movement of the sash will causethe spring to be unwound from the shaft 25 and wound about the shaft 29.By reason of the open position of the convolutions, the sash will have arelatively large movement as compared to the movement of the springuntil the convolutions around one of the shafts becomes tight, and thespring can be so arranged that it need move but a small part of themovement of the sash, thus materially increasing the life of the spring.This con struction permits a short spring to be used, and by having thespring always move in the same direction, there is less tendency for thesame to break while in use.

In the drawings are shown two sets or pairs of springs for the twowindow sashes, but it will be understood that only one window sash mayhave a spring or springs connected therewith, and that instead ofarranging the frame of the balance in the manner shown, the saidframemay be arranged at the lower part of the window frame or casing andso connected that the cable 23 need not be connected to a stud orprojection extending outward through a slot, but may be caused to passover the usual form of sash pulley, and thus dispense with the slots forthe projecting studs. Vhere the frame is connected as shown, brackets,as 3l, may extend outward from the frame on opposite sides thereof toadapt the frame to be held, and supported in position to have the cables23 properly connected to its respective spring.

As before stated a single or a plurality of springs may be used, andwhere a plurality of springs are used, one end of one spring maybeconnected to a shaft, and one of the other springs connected to a sleeveor tubular shaft; and if desired the spring or springs may be madestrong enough to raise a window sash when the latter is started orreleased.

From the foregoing it will be seen that a simple, compact and eificientsash balance is provided which is adapted to be connected to the sash orsashes in such a Way that the sashes will be properly balanced, and'willbe materially assisted in raising the same after' claim as 'new anddesire to secure by Letters l Patent l. A sash balance comprising acasing, a spring having each end formed into independent oppositelycoiled convolutions arranged in alinement, and a rotatable memberconnected to one of said ends and constructed to be operated by themovement of a window sash.

v2. A sash balance comprising a casing, a spring having its ends coiledin opposite directions to form independent spaced apart volute portionsarranged in alinement, means for preventing movement of one of saidends, a rotatable shaft connectedl to one of said ends, a drum carriedby said shaft, and means for rotating said drum, said volute portionsbeing so arranged that as one is tightened, the other is correspondinglytightened.

3. A sash balance comprising a casing, a drum mounted therein, aflexible connection for the drum adapted to be connected to a windowsash, whereby the drum will be operated and a spring having each endcoiled to form independent convolutions arranged in alinement, one ofsaid ends being connected to said drum, said convolutions belng soarranged that as one is tightened the other 1s correspondinglytightened.

rlhis specilication signed and witnessed this 2nd day of January A. D.1909.

MICHAEL J. DUFFY.

lVitnesses:

M. F. KEATING, M. COOKE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

